Microscope illuminator



June 11, 1935. s. AQELLESTAD 2,004,806

MICROSCOPE ILLUMINATOR Original Filed Feb. 2, 195:5

INVENTOR Patented June 11, 1935 1 a UNl-TEDSTAT ES orrie]; j

MICROSCOPE ILLUMINATOR Gerhard A. Ellestad, Rochester, N. Y., assignorto Bausch & Lomb Optical Company, Rochester, N. Y., a corporation of NewYork Application February 2, 1933, Serial No. 654,915

1 Renewed January 21, 1935 2 Claims. (Cl. 88-40) This invention relatesto microscopes and more tube I4 to the reflector 28 from whence they areparticularly it has reference to a device for illumidirected downwardlythrough the transparent hating an object which is viewed or photographedplate l9 and are then focused by condensing through amicroscope. lens 25onto an object below the objective. A

One of the objects of my invention is to provide centrally disposedopaque stop 30 is provided in 5 an improved device for illuminatingobjects which tube I 4 to prevent rays from passing to the openareviewed through amicroscope. Another object ing 29 in reflector 28. Noneof the light rays is to provide an illuminating device of the type fromthe source pass down through the objective described having improvedmeans for supporting but form a hollow bundle of rays which pass 10 thelight condenser in relation to the microscope downwardly around the bjecv to the j 10 objective. A further object is to provide a micro- Lightrays from t e il u a Object p pscope illuminator having lens elementsprovided W d threugh the bj c v a d 3,1011% the eXiS with apertureswithin which and on which the AA to the ocular, not shown. microscopeobjective is mounted. Other objects y Providing the slidably mounted10We1 5 and advantages reside in certain novel features 1 t s possibleto readily detach t j ctive 15 of construction, arrangement andcombination of and condenser unit. Obj v o different fecal parts as willhereinafter be more fully described e gths can be at a d to the bu 2land and pointed out in the appended claims, the relation of thecondenser lens 25 can be Referring to the drawing: altered by turningthe threaded member 25. The Fig. 1 is a vertical sectional view of anillumia pe p 19 provides means p 20 nating device embodying myinvention. ins h bj iv and still p mit light r y to Fig. 2 is asectional view taken on line 2 2 f pass freely down to the condenserlens without Fig. 1. any obstruction.

Fig. 3 is a sectional view of a modified form of In the modificationShOWn in I av illuminator. shown the lower casing 11 detached from the25 i A preferred embodiment of my invention is pp Casihg- Instead Of aflat p the lens illustrated in the drawing-wherein l0 indicates elementis mounted in cell at the t of the lower portion of the body tube of amicroeasing The lens element has the Censcope. Detachably secured to thebody tube l0 tral aperture in Whiehis mounted the metal 30 by means ofthe threaded portion H is the casing bushing p d w th threads 22' forde-' 30 12 having the side opening 13 in which is mounted tachahlyholding the microscope bj ctive 3'- the side tube M, the purpose ofwhich ill here- The member 24' is threaded to the lower end of inafterbe explained The lower end of casing l2 easing and Carries the e s eement 25' which is provided with dove-tailed lide 15 hi h cooperateswith lens element I9. to direct light operate with slides I6 on thelower casing ll y o an object below the j ve. The 35 and thereby affordmeans for detachably mountlens element 25 has the aperture 26' so thatthe ing the lower casing I! on the casing l2. Mountelement may b mOVedfi -w o ly with re ed at the top of easing I! by means of a threadedSheet to t bj t vecell I8 is a transparent plate or member H! which Fromthe foregoing t W b pp t tha I 40 may be formed of glass, quartz or anyother light am able to attain the objects of my invention and 40transmitting material. The plate 19 is provided provide an p v min nitof h yp ith a c ntral aperture 20 i hi h is t d described which will beefficient in operation and th t l bushing 2| provided ith threads 22 forconvenient in use. Various modifications can 7 detachablyholdingamicroscope objective 23. Obviously he made Without departingfrom the Mounted at the lower end of casing I1 is the Spirit Of my e 45member 24 which carries a condensing lens ele- I claim! merit 25provided with a central aperture 26, 1. An illuminator for attachment tothe body The objective 23 is adapted to pass freely through tube of amicroscope, Saidilluminetoreemprisihg the aperture 26 as the lens 25 israised or lowered a casing having means for attaching it to the byturning the member 24 which is threaded at body tube, a efi mounted inSaid a 50 21. Mounted in casing 12 is the inclined reflector said r r hvin a p i n for mi i 28 which is provided with an opening 29 in lightrays, a second casing detachably secured to alignment with the opticalaxis of the microscope said first casing, said second casing carrying aobjective 23. Light rays, indicated at L, from a transparent memberhaving a central aperture, a

laterally disposed source, not shown, pass through bushing mounted insaid aperture, an objective secured to said bushing, and lightcondensing means mounted on said second casing, said condensing meanshaving a central opening in alignment with said objective.

2. In an illuminator for microscopes the combination of a, casing, alens element mounted in said casing, said element having a centralaperture provided with a bushing, an objective detachably secured tosaid bushing, a 'second'lens element adjustably mounted in said casing,said second lens element having a central aperture through which saidobjective is adapted to extend, said second lens element cooperatingwith the other lens element to condense light rays onto an objectivewhich is viewed through said objective. I g V 'GERHARU A. ELLESTAD.

